They invaded Kymellia III to steal the Black Vortex, an ancient artifact capable of unleashing the cosmic potential of whoever wields it, for Mister Knife. Eventually, one of them succumbed to the Black Vortex's powers and was killed by Mister Knife.[2]

The Slaughter Squad later kidnapped Mister Knife's son, Star-Lord,[3] but he was ultimately rescued by his girlfriend Kitty Pryde.[4]

With J'son's plans moving forward after convincing Thane to join his cause,[5] J'son allowed the Slaughter Squad to submit to the Black Vortex, unleashing their cosmic potential and turning them into the Slaughter Lords.[1]